Your pay stub (also called an earnings statement or pay slip) is an official accounting document that details your compensation and every deduction made by your employer during a specific pay period.
Despite its importance, pay stubs are often filled with cryptic abbreviations like FED W/H, OASDI/EE, MED/EE, and SEC 125. This guide breaks down each section so you can audit your earnings and catch payroll errors early.
1. Pay Stub Anatomy: The 6 Core Sections
Most employer payroll providers (ADP, Paychex, Gusto, Workday) organize earnings statements into six standardized zones:
- Header Information: Pay period begin/end dates, official pay date, marital status, and federal/state exemptions on file.
- Gross Earnings: Hours worked, hourly rates, regular salary, overtime, bonuses, commissions, and total gross earnings.
- Pre-Tax Deductions: Elective employee benefits that reduce taxable wages (e.g., 401k, health insurance).
- Taxes Withheld: Statutory federal, state, and local payroll and income taxes.
- Post-Tax Deductions: Non-tax-exempt deductions taken from net earnings (e.g., Roth retirement, wage garnishments).
- Year-to-Date (YTD) Summary: The cumulative running total of all earnings and deductions since January 1.
2. Common Pay Stub Abbreviations Decoded
| Pay Stub Acronym | Meaning | Description |
|---|---|---|
| YTD | Year-to-Date | Cumulative total from January 1 through the current check. |
| FED W/H / FIT | Federal Income Tax Withholding | Advance installment of federal income tax sent to the IRS. |
| FICA / OASDI | Social Security | 6.2% Old-Age, Survivors, and Disability Insurance contribution. |
| MED / HI | Medicare | 1.45% Hospital Insurance contribution. |
| SIT / SWH | State Income Tax | State personal income tax withholding. |
| SDI / TDI | State Disability Insurance | Employee-paid state disability premium (e.g., CA SDI, NJ TDI). |
| EE vs. ER | Employee vs. Employer | EE indicates amount paid by you; ER indicates amount paid by your employer. |
| SEC 125 | Section 125 Plan | Pre-tax cafeteria plan deduction (health, dental, HSA, FSA). |
3. Why Checking Your YTD Totals Matters
The Year-to-Date (YTD) column is one of the most powerful diagnostic tools on your pay stub:
Tracking the Social Security Wage Base
For 2026, Social Security tax (6.2%) only applies to the first $181,800 of earnings. If your YTD gross pay passes this amount, verify that the OASDI line drops to $0.00 on subsequent checks.
Tracking the 401(k) Annual Contribution Limit
Ensure your total cumulative employee contributions do not accidentally exceed the IRS elective deferral limit ($23,500 standard limit for 2025/2026, plus catch-up contributions for age 50+).
Verifying W-4 Accuracy
If your YTD federal withholding multiplied across the remaining pay periods is significantly less than your anticipated tax liability, you should immediately update your Form W-4 to avoid an underpayment penalty.
4. Quarterly Pay Stub Audit Checklist
Review your pay stub at least once each quarter with this quick 4-step audit:
- Verify Your Filing Status: Check that the marital status (Single, Married Jointly) printed on the stub matches your latest Form W-4 submission.
- Confirm Benefit Premium Amounts: Check that open-enrollment changes (new health plan, updated HSA election) accurately took effect.
- Audit Overtime Hours: For hourly workers, verify that overtime hours were calculated at 1.5× your regular rate.
- Compare Net Deposit: Confirm that the net pay printed on the stub matches the exact penny amount received in your checking account.
To estimate your exact take-home pay, use our free Paycheck Calculator.
Official Sourcing & References
- IRS Form W-2 and Paystub Information: https://www.irs.gov/forms-pubs/about-form-w-2
- U.S. Department of Labor (Recordkeeping and Reporting): https://www.dol.gov/agencies/whd/fact-sheets/21-flsa-recordkeeping